<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            position: relative;
            margin: 100px auto;
            width: 100px;
            height: 300px;
            border: 1px solid red;
            /* text-align: center; */
            overflow: hidden;
        }
        
        span {
            position: absolute;
            display: inline-block;
            margin: 0 0 0 25px;
            bottom: 0;
            width: 50px;
            height: 100px;
            line-height: 100px;
            background-color: pink;
            transition: all .4s;
            transform: translateY(100%);
        }
        
        .box:hover {
            border-color: violet;
        }
        
        .box:hover span {
            transform: none;
        }
    </style>
</head>

<body>
    <div class="box">
        <span>
            更多
        </span>
    </div>
</body>

</html>